Developer Tools
JSON to YAML Converter
Paste any JSON and instantly get clean, readable YAML — perfect for Kubernetes manifests, Docker Compose, Helm values, and OpenAPI specs. Runs entirely in your browser, so your data never leaves your device.
Result
What makes this tool different
100% client-side
Conversion happens locally with js-yaml bundled into the page. Your JSON never touches a server — verify it in your Network tab.
Clean block-style YAML
Produces readable, 2-space indented YAML 1.2 that works with Kubernetes, Docker Compose, and Helm out of the box.
Handles nesting & arrays
Nested objects and sequences convert faithfully, and strings containing reserved characters are auto-quoted to preserve meaning.
Works offline
Because the logic runs locally, the converter keeps working even without an internet connection.
About this tool
JSON to YAML Converter: everything you need to know
JSON and YAML are the two most common ways developers store structured data, and switching between them is a daily task for anyone working with APIs, Kubernetes, or infrastructure as code. OpenToolLab's JSON to YAML converter makes the switch instant and private.
The converter produces clean, 2-space indented YAML 1.2 that works out of the box with Kubernetes manifests, Docker Compose files, Helm values, and OpenAPI specs. Nested objects and arrays convert faithfully, and strings containing reserved characters are auto-quoted so your data keeps its meaning.
Unlike tools that upload your payload to a server, conversion happens locally with the battle-tested js-yaml parser bundled into the page. Paste a sensitive deployment manifest or API response and convert with confidence — open the Network tab and you'll see zero requests.
Because the tool runs in your browser, it also works offline and needs no signup. It's the natural companion to OpenToolLab's YAML to JSON converter, which does the reverse in the same private, client-side way.
Whether you're moving a CloudFormation template, exporting an OpenAPI spec, or just prefer indentation over braces, this JSON to YAML converter turns the task into a single click.
FAQ
JSON to YAML Converter — frequently asked questions
How do I convert JSON to YAML online for free?
Paste your JSON into the input box, pick your indentation, and click Convert to YAML. OpenToolLab's converter runs entirely in your browser, is free forever, and requires no signup — your data never leaves your device.
Can I convert OpenAPI or Swagger JSON to YAML?
Yes. Paste any OpenAPI 3.x or Swagger spec that's in JSON format and the converter will output an equivalent YAML document. The block-style YAML output preserves all fields, so your spec works the same after conversion.
Does this work for AWS CloudFormation templates?
Yes. Paste a CloudFormation template that's written in JSON and you'll get the YAML equivalent — useful when you prefer the indentation-based format for infrastructure as code, or need to migrate an existing template.
How do I convert JSON to YAML in Python?
In Python you can use the PyYAML library: parse with json.loads(), then yaml.dump() the result. For example: import json, yaml; print(yaml.dump(json.loads(my_json))). If you'd rather not install anything, just use this online tool instead.
How do I convert JSON to YAML in Java?
In Java, the SnakeYAML library can dump a parsed Map: new Yaml().dump(new ObjectMapper().readValue(json, Map.class)). For a quick one-off conversion without a build step, this browser-based tool is faster.
Can I use this JSON to YAML converter in VS Code?
Yes — paste the JSON into this tool, copy the YAML result, and save it as a .yaml file in VS Code. For a full IDE workflow you could also use a JSON to YAML extension, but this tool needs no installation.
What is the difference between JSON and YAML?
Both store structured data, but YAML uses indentation instead of braces and quotes, which makes it more human-readable for configuration files. JSON is the standard for API data interchange, while YAML is preferred for Kubernetes, Docker Compose, and CI/CD configs.
Is converting JSON to YAML private and secure?
Completely. All conversion happens locally in your browser using js-yaml — nothing is uploaded, stored, or tracked. Open your Network tab while converting and you'll see zero requests leave your device.
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